Osma bottle gully has missing insert

ThisIsWeird

FreeBear said:

ThisIsWeird said: the unavoidable fact that they don't 'alf get on my boobie on occasion

There is always the ignore button - Just click on the user profile, then the button to the right of "Message". Got a couple on my list, and off to add another.

NNNNOOOOOOOO!

Downthedrain

Osma kindly replied to my email to say "The product in the photos is our old 4D700 gully which was sold in the 1970’s. Unfortunately, we no longer have any components for it."

Looks like I'm out of luck. Some ingenuity required and a tricky problem, but at least now I know how it fits together. I think the chances of finding the actual part are slim.

Section62

Downthedrain said:

Looks like I'm out of luck. Some ingenuity required and a tricky problem, but at least now I know how it fits together. I think the chances of finding the actual part are slim.

How much surface water drains into it?

If replacement of the gulley wasn't an option and there isn't much in the way of surface water, then I think my 'temporary' solution would be to cut a piece of wood slightly smaller* than the diameter of the top of the gulley, drill a hole to take the waste pipe, and then fit the wood in place of the original grille.  That would have the effect of minimising the smell - you could go further and run a bead of silicone around the gulley and tthe waste pipe to seal it up fully, but the more you seal it up, the more of a problem you might have with surface water, and you may need to do something with the waste pipe to avoid the traps being syphoned.

Obviously don't seal the gulley up if it is needed for surface water drainage, unless you make some alternative arrangement for that.

*the wood will swell when it gets wet. If cut to fit the gulley too snugly the swollen wood will be impossible to remove later if you need to clear/clean the gulley.

Alternatively, you may be able to effect a partial reduction in smell by using a short length of half-round plastic gutter and a couple of stopends (solvent solvent welded back-to-back but twisted 180 degress) - with some kind of bracket to fix it to the existing screw hole.  It wouldn't be perfect, but might help to reduce smells.

Eldi_Dos

mytub have it listed but no longer available but there is a drawing with dimensions which you may be able to use if making modifications to a more available item.

Section62

Eldi_Dos said:

mytub have it listed but no longer available but there is a drawing with dimensions which you may be able to use if making modifications to a more available item.

That one is a different design - I'm not convinced 4D700 is the right part number, I think it ought to be more like a 300 or 400 series and have a feeling it ended with a '6'.  I don't have my old Osma catalogues to hand, so can't check at the minute.

Section62

Wavin were correct of course, the gulley was the 4D700.  They also sold the grate as a spare 4D706 (I think that's where I got the '6' from) and the baffle as 4D710.

The following extracts are from the 1985 product list and a price list from 1986.  The spare baffle (4D710) was a very expensive £2.94... building merchants would typically give between 33% and 50% off the list price, so someone who had the foresight could have stocked up on spares for a couple of quid (or less) each. 

The replacement version 4D900 appears in the 1992 catalogue.

ThisIsWeird

DtD, what empties into that gulley? That black waste pipe in your first photo - is that from your kitchen sink?

Anything else empty in there - apart from, perhaps, some surface water?

If only - or largely - the kitchen sink, then that's typically a 1.5" waste pipe, so not much apart from odd gushes. I think it might be quite possible to make up a very simple - and easily removable - syphon pipe to fit into that gulley outlet, and provide the seal you need.

That outlet pipe is presumably ~100mm, and the next-smallest, easily obtainable pipe and fittings I can think of are rainwater goods, which are typically 68mm.

Something like the following, and with a suitable rubber gasket (possibly the type for a toiler pan connector?) fitted on the reducer-connector part that goes down the gulley pipe. The bottom of the new inlet pipe end will need shaping to sit against the bottom corner of the gully, whilst allowing water to get in freely. Solvent it all together to make it airish tight, after proving it can all be prised out when required.

You might find all these bits for next to nothing on your local Facebook Marketplace. 

 

Eldi_Dos

Neoprene tape finished off with some self amalg tape would work for a gasket in TIW's solution.

Downthedrain

My apologies - I've been away from the forum due to a family emergency.

The black pipe is the kitchen sink outlet. There's some rainwater runoff, but my plan is to divert this to an adjacent gully that only takes rainwater and drains into a soakaway. The less surface water that goes into the septic tank, the better.

The dimensioned cutaway drawing is really useful and clears up why there is a grid section on the top - not really necessary in my application. I think armed with some lengths of pipe, solvent weld and sealant I should be able to construct something effective. The siphon idea appeals and is ingenious in that it maintains a water seal with the cutaway.

I have some toilet pan doughnuts somewhere - solid rubber and neoprene types. I'll let you know how this works out.